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Abstract
Crystal structures, microstructure and microwave dielectric properties were investigated for dense ceramics with single phase of AZn2(PO4)2 (A = Sr, Ba). It was found that crystal structures with large difference can be obtained in SrZn2(PO4)2 and BaZn2(PO4)2, which leads distinct variation of sintering and microwave dielectric properties, in which SrZn2(PO4)2 ceramics has ϵ = 6.29, Q × f = 21600 GHz (10.9 GHz) and τf = − 70.4 ppm/°C when sintering temperature was 940°C, and can be co-fired with copper electrode in N2 atmosphere; while the BaZn2(PO4)2 ceramics could be sintered at a relative higher temperature, 1000°C but higher τf value was obtained, with microwave dielectric properties as ϵ = 7.72, Q × f = 17000 GHz (9.9 GHz) and τf = − 41.1 ppm/°C.
Funding
This work was supported by the 973-Project (2009CB613305), National Nature Science Foundation of China (NSFC, 50932007), Key Discipline Development Project of Anhui Science and Technology University (AKZDXK2015A01), and Talent Introduction Special Found of Anhui Science and Technology University (ZRC2012327).